diff --git a/docs/index.rst b/docs/index.rst
index fa90db8c..ba511f5e 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -86,6 +86,11 @@ The basic usage is like this:
 		languageData.getAutonym( 'en');
 		// Returns version of the language data or UNKNOWN if not declared
 		languageData.getVersion();
+		// Returns an object mapping all territory codes to their language arrays
+		// e.g. { US: ['en', 'es', ...], DE: ['de'], ... }
+		languageData.getTerritoriesWithLanguages();
+		// Returns the languages spoken in a specific territory
+		languageData.getLanguagesInTerritory( 'US' );
 
 The exposed methods are similar to the methods present in the PHP `LanguageUtil <api/languagedata/languageutil.html>`_ class.
 
diff --git a/src/LanguageUtil.php b/src/LanguageUtil.php
index 692ef246..1fe6765d 100644
--- a/src/LanguageUtil.php
+++ b/src/LanguageUtil.php
@@ -7,6 +7,8 @@
 
 namespace Wikimedia\LanguageData;
 
+use stdClass;
+
 /**
  * A singleton utility class to query the language data.
  */
@@ -365,6 +367,15 @@ public function getDir( string $languageCode ) {
 		return false;
 	}
 
+	/**
+	 * Returns all territories and the languages spoken in each.
+	 * @return stdClass An object whose keys are territory codes and whose values
+	 * are arrays of language codes spoken in that territory.
+	 */
+	public function getTerritoriesWithLanguages(): stdClass {
+		return $this->data->territories;
+	}
+
 	/**
 	 * Returns the languages spoken in a territory
 	 * @param string $territory Territory code
diff --git a/src/index.js b/src/index.js
index 1ba2a3aa..8d81c2d2 100644
--- a/src/index.js
+++ b/src/index.js
@@ -284,6 +284,16 @@ function getDir( language ) {
 	return isRtl( language ) ? 'rtl' : 'ltr';
 }
 
+/**
+ * Returns all territories and the languages spoken in each.
+ *
+ * @return {Object} An object whose keys are territory codes and whose values
+ *   are arrays of language codes spoken in that territory.
+ */
+function getTerritoriesWithLanguages() {
+	return languageData.territories;
+}
+
 /**
  * Returns the languages spoken in a territory.
  *
@@ -328,6 +338,7 @@ module.exports = {
 	getRegionGroups,
 	getScript,
 	getScriptGroupOfLanguage,
+	getTerritoriesWithLanguages,
 	isKnown,
 	isRedirect,
 	isRtl,
diff --git a/tests/js/index.js b/tests/js/index.js
index d3ed4a8d..ed67127e 100644
--- a/tests/js/index.js
+++ b/tests/js/index.js
@@ -151,6 +151,14 @@ describe( 'languagedata', () => {
 			'An invalid country has no languages and returns an empty array'
 		);
 
+		const territories = languageData.getTerritoriesWithLanguages();
+		assert.ok( typeof territories === 'object' && territories !== null, 'getTerritoriesWithLanguages() returns an object' );
+		assert.ok( Array.isArray( territories[ 'US' ] ), 'US territory entry is an array' );
+		assert.ok( territories[ 'US' ].includes( 'en' ), 'English is listed for the US territory' );
+		assert.ok( territories[ 'RU' ].includes( 'sah' ), 'Sakha is listed for the RU territory via getTerritoriesWithLanguages()' );
+		assert.ok( Object.keys( territories ).length > 0, 'getTerritoriesWithLanguages() returns a non-empty set of territories' );
+		assert.strictEqual( territories[ 'no-such-country' ], undefined, 'An invalid territory code is not present in getTerritoriesWithLanguages()' );
+
 		const languagesAM = [ 'atj', 'chr', 'chy', 'cr', 'en', 'es', 'fr', 'gn', 'haw', 'ike-cans', 'ik', 'kl', 'nl', 'pt', 'qu', 'srn', 'yi' ];
 		assert.deepEqual(
 			languageData.sortByScriptGroup( languagesAM.sort( languageData.sortByAutonym ) ),
diff --git a/tests/php/LanguageUtilTest.php b/tests/php/LanguageUtilTest.php
index eec2603b..658ec8f9 100644
--- a/tests/php/LanguageUtilTest.php
+++ b/tests/php/LanguageUtilTest.php
@@ -198,6 +198,28 @@ public function testGetLanguagesInTerritory() {
 		$this->assertNotContains( 'de', $actualsAFG );
 	}
 
+	public function testGetTerritoriesWithLanguages() {
+		$territories = $this->languageUtil->getTerritoriesWithLanguages();
+
+		$this->assertObjectHasProperty( 'US', $territories, 'US is a known territory' );
+		$this->assertContains( 'en', $territories->US, 'English is listed for the US territory' );
+
+		$this->assertObjectHasProperty( 'AT', $territories, 'AT is a known territory' );
+		$this->assertContains( 'de', $territories->AT, 'German is listed for the AT territory' );
+
+		$this->assertObjectNotHasProperty(
+			'no-such-country',
+			$territories,
+			'An invalid territory code is not present in getTerritoriesWithLanguages()'
+		);
+
+		$this->assertGreaterThan(
+			0,
+			count( (array)$territories ),
+			'getTerritoriesWithLanguages() returns a non-empty set of territories'
+		);
+	}
+
 	public function testAddLanguage() {
 		$this->assertFalse( $this->languageUtil->isKnown( 'xyz' ) );
 		$this->assertNotContains(